I have an old Orc and Goblins collection. I'm thinking about pushing Night Goblins and have read their war scroll. I noticed the mentions of 20 and then 30 Night goblins in a unit.
Q.Would 50 be too big?
It depends on the style you play. In Open, no limits or minimums of any kind, it seems. In Narrative, you choose from a list which tells you how many models you take, but currently Narrative only indulges the new factions (this is wholly new AoS factions, and not repackaged ones like Seraphon and Ghoul Courts). Narrative is already flawed. Not a fan. In matched, you have points, and a minimum and maximum unit size, plus a battlefield designation.
"Moonclan Grots" (i.e. Night Goblins) are minimum 20 and maximum 60. Every unit has a min and max. The points buys you the minimum, and then you buy in multiples of that minimum. Most of it is based on boxed sets it seems, so Night Goblins could be 20, 40 or 60 sized in matched play, although you could easily divide the points to get other numbers, so long as you don't start getting crazy fractions (although the rules insist you pay full points. Basically, don't do advanced maths). It's 120 points for 20 Goblins. I haven't playtested the points system yet, so I don't know how well it works. The book looks a little rushed, as is usual for GW books: too much content, not any polish.
The designations mean Matched play also has the type limits that WHFB had. So only so many Behemoths, a minimum Battleline (basically Core Troops, Night Gobbo Warriors are battleline) and so on. Some things are "other" Fanatics fall under that one (there's no limit on those).
Q. Aside from the time it takes to push the models around would 45 o 50 be too much in a unit for AoS?
Don't want to be too Over the top
Not necessarily. Big units can be nasty, or a liability. As morale is tied to numbers of casualties, big mobs have to be very careful about battleshock. If I say, concentrate all my attacks on your Night Gobbo blob and kill say 20 of them in a phase with shooting, your best morale is 6 (it's likely to be 4), that's 14+D6 models running away at the end of the shooting phase. That was a good shooting phase mind, but still. You can make them immune to Battleshock, but that means babysitting with your commander and using the Inspiring Presence Command Ability, rather than their potentially more offensively useful personalised Command Ability.
They're easier to buff, but more eggs in one basket. It's one of the aspects of AoS that I like most.
Under the Orc Warbosses command ability it mentions Orruks with in 12" of him. Where do these Orruks come from?
I only have the free PDF's right now. Was that reference a typo?
It's actually written ORRUKS. The distinction is important. Basically, every unit in the game has Keywords (they're listed at the bottom in CAPS). Learn them, know them. Certain spells, command abilities, abilities, weapons and such will often affect stated keywords. Sometimes it's a whole faction: Destruction, Order, Death or Chaos; sometimes it's a specific faction, like Fyreslayer, Moonclan, Ironjawz etc; or sometimes it's a specific race, so Duardin, Orruk, Grot, Aelf etc. Yes, they are the new MAXIMUM COPYRIGHT names, but they effectively work the same.
Any models that fall under those circumstances that have that keyword (nominated unit, within a radius, suffered a wound, etc) are affected. In most cases, it's command abilities, so the game rewards you for taking things that synergise.
In this case, anything that is an Orc model is an Orruk (and thus will have that keyword). It will affect those models. So the command ability doesn't work on Goblins and Trolls for instance.
Were Old World models given points in the new handbook?
As far as I'm aware everything that at least got rules on the Free Warscroll PDFs (including Tomb Kings and Bretonnians) has a point value in the General's Handbook, at least for matched play. But there are three ways to play. Open, you take what you like. They seem to have made those rely on objective based missions to try and balance this. Narrative is for new things as I mentioned above. But matched is what most people will play (and that looks like where most of the effort went, although that's probably not saying much) and that covers everything that got included with rules at some point in AoS' short development. So if it didn't have rules in its old battletome compilation (the free PDFs off GW's website) then no. Otherwise, yes.