I'm not a cheerleader for XMV, but it says on the website to transfer your Monero to another wallet after the fork so that you aren't risking your XMR when you import your keys to the XMV wallet. If they were trying to steal your XMR, I seriously doubt they would suggest that.
Simply wait a bit to see what happened before doing those steps yourself.
Forks of Cryptonight algorithm coins are hottest trend in recent weeks.
ASICs to come, consequently forks are one of the easiest, fastest approach to deal with dominant hashrates from ASICs, which in turn result in potential replay attacks in the future.