Apparently he wanted to move back to California. Some information on his new job:
Following the press release announcement that current Xbox 360 VP Peter Moore would be jumping ship from Microsoft to head up the EA Sports division came details on Moore's new salary. An SEC Form 8-K filing detailing Peter's compensation reveals that his new base salary at EA will be $550,000 not including a "discretionary target bonus" of 75% of his annual base salary, up to $412,500. In other words, he's rich, bitch. But that's not all.
In addition to his base pay, Moore will also receive a signing bonus payout of $1.5 million if he remains with EA for two years. However, that bonus will be paid out within 30 days of his employment, to be repaid if Moore moves on from the company.
Moore will also received a stock grant of 50,000 restricted shares, half of which vest at two years into his EA employment with the other half vesting at the four year mark. At the current after hours value of EA stock, his shares would value $4.26 million. He's also been given a stock option grant to purchase 350,000 shares as part of the company's Equity Incentive Plan.
On top of all that Moore moolah, the former Sega Dreamcast exec will be granted $330,000 in moving expenses.
Source:
Kotaku