If you missed the live stream, here's the two videos:
For the most part everything ran fine on Ridiculous large map settings with all of the standard faction AIs.
some minor issues (already posted elsewhere):
Custom Faction --
Sovereign icon picture doesn't include their face.
Sovereign name string length is different in almost every text location. So you can type a longer name in the faction creator, and it looks fine, but once in game almost every location has a shorter display string length.
Sovereign custom backstory didn't make it into the game.
tech tree UI can get messed up very quickly (connection lines disappear, text and art disappear).
Otherwise, maybe tone down the wolves a bit.
Most strength calculations were wrong.
The army strength icon (swords/shields) on the army does not always appear. Sometimes it won't be there when you click on the army.
The biggest thing to work on would be the start location mechanics. Getting stuck behind monster armies that you can't possibly fight in the early game can seriously hamper the whole game.
edit: and Monsters still salt the earth.
I will probably continue with a FE LH Beta lets play on some of my streaming nights, as the expansion does seem a lot more fun than FE alone.