I've never seen any tangible evidence of any console getting a sales bump strictly from E3 without a price cut being in the equation.

Next week we will still see the "launch week" effect but i expect huge fall after that so 2 week for me.:)

I'd give it two weeks.

The MK8 word-of-mouth is still rather strong, and is going to spur on more sales at least for a while longer. If E3 brings strong titles and more killer promotions akin to what came with MK8's free game, you can probably expect more hardware sales as word of that spreads too.

One of the biggest sellers for WiiU right now, through said word of mouth, is the fact that you can get a bunch of games and the console for 300$. That tends to get people's interests piqued.

2 weeks, 3 max.

Week 1: 185k (even though I suspect this is a tad overtracked)
Week 2: 100k
Week 3: 65k
Week 4: 48k
Week 5: 40k

Unfortunately I think the weakness in Japan hurts the Wii U, it will be back down to sub-10k levels there quickly, which limits the Wii U's potential.

next week, if not the week after that.

2 weeks.../// beginning of July!!!

I expect it to do so in 2 weeks.

I would expect a 50% drop next week, but the late in week release of MK8 could mean some spill over to this week. So I'll say 2 weeks.

I voted 4 as an outside chance, but I'd give equal odds to 3/4 weeks.

Next week I think it may even be higher than this week, 190/200k (!), then down to 150k, then either slightly above or slightly below 100k (10k either side) and then again slightly above/below for week 4.

Of course, E3 could shift that, as last year Nintendo and Sony (preorders) both got a boost out of E3.