People retiring are getting out while the getting is good.
F11X management isn't telling you about the future because, either:
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They don't know themselves, there are different possibilities for the site, and it's just one ambiguous mess.
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They do know it will close (perhaps not exactly when, but with only a month or two uncertainty) and they don't want the workforce to bolt out the door. The good people are the first to leave.
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They're depending on a miracle to happen.
When the closure is announced, Intel will likely pay a bonus to those workers who work to the very end. At minimum, you can get that bonus.
If you would feel more secur having a longer term job, start looking now. Once you find one you like, resign from Intel.
Look at the signs around you. The site is going to close in the near future (< 1 year).