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I have zero knowledge about military things or tactics other than wiki stuff but I'm assuming they'd hope to be able to form a new tank battalion if not brigade. And/or they could mix the "diesel" tanks (Challenger 2 and Leopard 2) with T-72s and T-64s while the Abrams with the T-80s in existing formations.
The sooner Ukraine receive the tanks it requested the better.  The personnel manning the tanks will get crash course to master their new tool to fight Russians. >

Saw the Challenger 2 tanks need a 6 week training course (including support).  Wonder how long it is with the leopard 2 also when they started training on them.
The mix of tanks will be interesting for tactics.