Will blizzard let us know when they have decided to stop sending out beta invites?

I'd just like to know if thats the case and there will come a time i can stop checking my b.net account.

We probably won't end beta until shortly before release, and traditionally we've tried to announce release dates about two months before release. I couldn't speculate how invites might ramp up or down when the beta finally comes to a close, it definitely is not coming to a close yet though.

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Q u o t e:
Bashiok did say there was a strong possibility of a demo after release

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We'll probably make a trial edition at some point. It's sort of a demo I suppose, but it's a bit better because it's essentially the full game just with locks put on certain areas. So you'd be able to jump into multiplayer games with your friends, but maybe you wouldn't be able to play beyond a certain place and wouldn't have access to all the game systems (certainly not auction houses) but if you choose to buy the game all that stuff just unlocks.