Just read something that had Pachter claiming GTAV would get dated the day before E3 just to show up the convention, i wonder, if it even happens, if the announcement of Half Life 3 could over take even a date for GTAV this year
Probably could. A new Half-Life would be major news given the long wait for it.
Sony and Microsoft's conferences take place on June 4th. Microsoft's being at 10 am and Sony's at 6 pm, both in Pacific Daylight time. No idea on Nintendo's yet. I'd bet it happens on the 5th at 9 am, though, if their history is indicative of anything.