But what i also saw was they they will be running on the new PCIe 3gen slots which is gonna mean new mobos to. if this is true then that means i'll have to rethink this build down the line but its a budget build not really lookings to get top of the line not for a little while atlease.
Not really, PCIe 2.0 was backwards compatible with 1.0, so I don't know why PCIe 3.0 wouldn't be backwards compatible as well.
Graphics cards haven't even saturated PCIe 2.0, so I doubt there will be a big enough performance bump in this next generation to finally saturate PCIe 2.0.
I would wait. I know I am definitely interested to see what AMD has to offer this fall/winter.