To backup N4BB's report, BerryReview is reporting that the 21st is indeed confirmed by RIM through a webcast from earlier today.
Will it release as promised and the 21st? RIM learned to be tight-lipped on release dates since they keep missing the target dates. As February is quickly drawing to a close, the OS update should be releasing soon. I believe that if the update will be releasing 21st (or even Monday the 20th), RIM would make the announcement by Monday.
Time will tell.
Dear, RIM. HURRY UP!