Shag, is from Superboy #1, written by Jeff Lemire and with art by Pier Gallo. On the last page of the issue we get these teaser images, including that Thanagarian looking chum in the bottom panel.
According to an interview with Lemire over at The Superman Homepage, the character is named Hawklad and is part of a group named (as is evident here) The New Titans.
And as for the mysterious "New Titans" I won't tell you what their story is yet, but the characters are as follows: Hawklad, Negative Lad, Elongated-Lass and The Bat-Man. Oh and one of them is Tim Drake!
Who is Hawklad? Hawkman was never represented in the Teen Titans traditionally (and no, Golden Eagle doesn't count) because Hawkgirl held the dual position of love interest and sidekick. But with the seeming re-emergence of Thanagar in titles as varied as Rann-Thanagar War (and Holy War), World of New Krypton, and Brightest Day, now seems as good a time as any to introduce a young Thanagarian Wingman to adventure on Earth. Of course, I doubt it will be that easy, but should be fun reading if nothing else.
Image: Teaser page from Superboy #1, 2010, Pier Gallo.