Maybe it's premature to ask this, but will there be separate SKUs of the Ultimate Edition? Specifically, will there be a Personal and Enterprise SKU?
While I love the idea of open sourcing the basic IDE, IMO there are still too many features missing from it for a professional developer.
I remember when Borland was trying to sell JBuilder Enterprise for $3500/seat. Nothing grew Eclipse adoption more than that bone-headed move. In contrast, IntelliJ/JetBrains adopted a more reasonably priced, two-tiered approach, the Personal and Commercial. For independent consultants, the Personal license was affordable, but still powerful. For larger companies, the Commercial license was still affordable.
I'm hoping JetBrains doesn't try to make the limited Open Source edition replace the full-featured Personal Edition.