To coincide with the launch of GBA game on the virtual console.

Possible? We're about due.

EDIT: Direct Tuesday 8th April, see below!

This goes hand in hand with my bi-monthly directs prediction

I've voted "yes", but I only because I believe there will be a Direct in April. Nintendo have to start showing what kind of products (beyond Mario Kart 8) they're launching in their new financial year to meet whatever targets they'll set, improve Wii U's situation and reach profitability.

We didn't get one in march yet, did we? So then I guess we'll need a new one before april 1st.
Maybe this week? Who knows, Iwata did say during the last one that it was a bit later than we're used to, which lead me to believe we'll see monthly ND's again.

As I predicted, March will not have a Direct, but April will. I don't expect it for another 2-3 weeks, however.

I think the next one will coincide with the fiscal year results

Most likely. Then 2 months later will be E3.

I only expect one in the first days of May.

Guys what if April has three directs in it alone? Could we handle that much "directly to you" or would we mindplode?

I doubt there's a direct this month, but hopefully April and May will have one.