Half Life 2: Episode 3 set for E3?

A mysterious image of the Half-Life logo with the words “Freeman, June 14th” underneath has been making rounds on the net today. The photo looks like it could be that of some sort of promotion booklet or poster.

This comes after Valve canceled their Portal 2 event at E3 for a “surprise” announcement instead.

Microsoft’s media briefing is also on June 14th. Will we see Half Life 2: Episode 3 at Microsoft’s conference? I have good reason to believe it’s a PC exclusive, but we’ll have to see come E3.