The HTC Evo 4G LTE is currently stuck in U.S. Customs (thanks, Apple), delaying the May 18th launch on Sprint. Customers who pre-ordered from Best Buy are now receiving emails updating them of their order status, stating a new release date of May 23rd.
Interestingly, HTC wasn’t as date specific as Best Buy in their statement:
HTC is working closely with U.S. Customs to secure approval for shipments of the HTC One X and HTC EVO 4G LTE. We have not made any announcements about a new launch date and will provide an update on availability as soon as we can do so confidently.
Best Buy setting a May 23rd date does not guarantee a release on that day. Until the phones are released from U.S. Customs no one can be sure of when the phones will make it stateside.
source: the verge