I like the idea of the jeeps, but that'd cause quite a bit of lag with the lower-end phones. Tanks have caused a similar complaint.
Also, is it really practical to have 2 person jeeps? In theory, there's 4 people per team, would you really want half your team in a jeep? And what would happen when you were waiting for someone else to get in the jeep? Would you just try to drive around, defenseless? Even the tank has a gun to deal with planes.
As for the ejection, that's a pretty cool idea. It'd cause a lot of noobs driving around in tanks, but they'd learn pretty quick. I hope.