I ordered mine from Bestbuy. The order page said it should be delivered between 5/11 and 5/16. Now they are just saying that its a pre-order. We'll have to see when they start rolling out.
Oh, And I wanted to share this with you guys: https://insidesprintnow.files.wordpress.com/2012/05/20120418_htc_evo_4g_lte_user_guide.pdf