We've seen no rumor about a late summer opening. In fact, the AP Blockout Calendar would seem to contradict any such rumor. The lower APs are unblocked starting the 3rd week of August 2019, after being blocked from DL for most of the summer. It makes no sense for Disney to open SWGE just as most of the APs are allowed back into DL. As stated above, the major AP block starts the third week of June 2019, so that is when most bets are being placed for SWGE to open.