They'll at least have 30 M1 Abrams tanks. Probably some more Bradleys and Strykers. I believe several NATO countries have also promised a mishmash of IFVs and tanks (more T-72s, Leopard 1A5s, PT-91s and a handful of Leopard 2). The tanks are mostly older, but Russia is sending even older stuff.
Not enough, but a start. Everything depends on how things go this spring/summer.
“11 Brigades is the number of brigades forming”
I would guess three brigades would be Mechanized (predominantly Infantry Fighting Vehicles), for every one that is Armored (predominantly tanks). Likely at least one Brigade of Artillery, and possibly (probably) some special purpose units like Combat Engineers, Ranger/SOF, or Aviation (helicopters). They could well have some units configured for occupation (Military Police/Carabinieri functions) or border security; as well as just assault forces.
The force mix would depend on the Intel they have on enemy forces, and the types of plans they are developing - and of course, what they can get resourced from donor nations. I expect that any reasonable Operational Plan that it is staffed and approved, is going to get resourced.
I expect to see more Leopards and Bradleys, as well as a continued mix of other vehicles - and F-16s or the equivalent.
It sucks to be Russia.