I seriously doubt they would go to hex. Base 36 perhaps, but certainly not base 16. The work required to go from decimal to base 16 is the same as to base 36, but the latter provides far more unique values.

BTW, base 36 = [A-Z0-9]

Its nice to think that perhaps they might even go to base 62 or base 64, but the likelyhood of error mistaking a lowercase letter for an uppercase one (or vice-versa) makes me think that that is even less likely than hex.

Yves / DeMerphq
---
Software Engineering is Programming when you can't. -- E. W. Dijkstra (RIP)