I do hope they don't give Mechanized Assault the straight up 250 from Infantry though... I feel like the clown car cheese with early Ass Grens would just be toxic. +1 To Relief Infantry and Stuka Flame Run getting fixed. I would also suggest reworking the medical crate drop - maybe reduce the cost and have it drop one crate. Dropping 3 crates is too hard to use near the frontline because you rarely use them fast enough to not run risk of them getting stolen and dropping them at base is pointless when it's much more efficient to build a healing bunker. Med kits are also omni-present in OST and dirt cheap now... so you really need to work the buff angle to make the ability usefull.
That's the reason that i think swapping the PG for a Gren would make more sense for the Assault Gren commander and you can usually skip T1.
I don't have the timings in my head, but i think the Pio flamer is still a better option regardless of having AssG.