If it follows the trend with every other transition between versions then yes you will have to start from scratch again. But v7 is meant to be a long way away so there's no need to worry about it now.

Do you get to keep your money?

No. Everything is reset. Mcmmo skill levels, money, world etc.

As Adrian said, the next version is at least 3-4 years down the road and V6 just came out at the beginning of this year. So just have fun. While with every new version you lose everything you've worked hard for, I think what's most important is having fun and becoming a part of this wonderful community. Enjoy Noobscraft fully!