I recently got the obj.263 and I am loving it(I have the Grille and 183 and out of those the 263 is my new favourite) . So today I played about 20? battles with the obj.263 and found out that the Ace requirment has gone down quite a bit for today at least. From the pictures about 1230 which I think is very low for a T10 tank. And stat wise the 263 is not a bad tank.(Over 50% winrate according to Blitzstars)
So yeah, it kind of felt weird that they gave me Ace tankers when it normally shouldn't.
Proof of the low Ace requirement.(I will admit that I am bragging with the last picture and maybe all the pictures.) Timestamps are all today.