Welcome to the Rx-8 forum! I'll try to answers all of your questions:
I don't know too much about the new renesis rotary in the Rx-8, its improved and it 250hp all N/A which means it will last a very long time
1) It all comes down to how you maintain your car, treat it like **** and it will do the same to you. Rotary engines are very reliable if maintained properly and i'll be honest with you, the turbo rotary engines don't last as long as the n/a ones but if you take it easy and don't overboost or race every damn day they will last. My 1984 Rx-7 has 250,000 original miles and it still runs very strong because i take care of it.
2) i'll give you a couple of links:
3) There isn't much of a difference between rotary maintenance and piston maintenance, but here's a couple of things you should always do if planning to owning a rotary 1) check the oil every week, if you run low on oil you'll harm the apex-seals and eventually lose them. 2) change the oil every 2000 miles and not 3000 miles like piston engines....thats all for now if you decide to own a rotary let me know and i'll give you many tips and tricks.
I hope i answered your questions, have fun in the forum!