It may be the end of March, but gaming companies are already getting ready for the summer. First up is Xbox, which just announced that it will be holding its next major showcase event on June 7th. That’s a typical window for Microsoft — last year’s edition took place on June 8th — and fits snugly into the timeframe of Summer Game Fest . It’s an important moment for Microsoft’s gaming division, which just saw a big upheaval in which longtime Xbox boss Phil Spencer retired with Asha Sharma taking