It's employment at will in that you can quit any time and they can fire you any time.

However, the part that says you get $50,000 in moving costs subject to staying for two years is an enforceable part of the contract.

The most dangerous words in the English language.

Like any exciting opportunity, there is a chance that it doesn't bear fruit.

Probably none because bonuses in any shape or form are always at the discretion of the employer.

For that kind of money you should be consulting an attorney and reviewing your options.

Do I really have to translate that for you?