My source is: http://www.team-aaa.com/news-16590-0-1-la_beta_reprend_le_premier_juillet.html
It's a French Esport website.
It doesn't seem weird since PC BanG are one of the partners Blizzard announced during their press conference of the 24th of June.
Team aAa confirmation on this thread (page 6):
Being from team aAa's shoutcast staff and having a colleague who lives in Korea who confirmed this on top of everything, I can pretty much assure you guys that the news is legit. Our website has a reputation amongst french esports fans which obliges us to be as accurate as possible whenever we post anything in our news, getting multiple confirmations to ensure quality of information and professionalism behind every post.
Korean links from PlayXP and GameMeca talking about beta restarting on June 28. Since i only used google translator i have no confidence, just pointing articles related to a potential restart of the beta.