Few general questions. Hopefully returning to racing!

[Timee80]

Its been a while since i was racing due to personal circumstances (about 3 and half years roughly,) but will hopefully be starting back again. The Mrs has given the go ahead, including the purchase of a new kit. I currently own a losi 22 2.0 and also a 1.0, and im fully aware these aren't competitive these days.
Ill start on the questions then
1- Is 2wd the most popular class still?
2- Which kits are the ones i should be looking at? taking everything into account that goes with long term ownership / racing
3-Is the turnout of racers at similar levels as they were 3 years ago? (i remember oople being far busier than it currently seems to be)
4- has there been any new great advances in tech? or will my current radio, brushless and lipo gear be fine to re-use?
5-Do people still use 6.5t - 8.5t motors mainly? or has it gone down the different spec classes like over the pond?
Thanks in advance everyone. Im looking forward to it already!!