I will not buy a new iPhone until it has at least 64 GB of flash installed. Like many of you, I was hoping that this would happen with the June model, but at this point it seems HIGHLY unlikely.

We've now seen a 16 GB model which implies a 16 / 32 GB only offering. It also appears that the new phone still only has one flash memory slot, and since 64 GB flash prices have remained high and even gone UP the last year or so, I cannot see Apple offering a very high price 64 GB model. It would just be too expensive in today's market.
I'll keep my fingers crossed here, but Apple has always tried to keep the prices of their high / low end models similar between years, and 64 GB modules are not even close to the cost that 32 GB modules were last year, so to me the odds are very slim we'll see a 64 GB model, since it would probably cost $1000 unsubsidized.
Tony