Well last year the announcement for the EVO release date was May 12th (The second Wednesday in May) so if they are following the same schedule the announcement would come tomorrow.
Of course, last year Sprint announced weeks in advance that they would be holding a special EVO event on May 12th, this year no special EVO 3D events have been announced.
I wonder how much iphone5 is effecting the drop date for EVO 3D. Sprint would want this phone out before the iphone and with all indications that the iphone 5 is to be released later this year (or early 2012) rather than sooner could that delay the release of EVO 3D in order to fine tune it?