They were available in all segments for PHL-LGW (Jan), PHL-MUC (Feb), and it's looking very much like they'll be available for an upcoming PHL-DUB flight in mid-May (only one C seat sold on the outbound, 3 on the return).

As to calling at the 30 hour mark versus chancing it... I couldn't tell you on that. I know when I did OLCI it didn't offer me the ability to upgrade in January, and I simply waited until I got to the airport for the MUC flight - it was kind of like, "well if it's available I'll do it, if not, I'll enjoy the extra $500 when I get to MUC".

One other thought - in Germany they charged me in Euros (no choice was given), though the exchange rate wasn't quite what it is now, so the final bill was something like $522. If they ding you in pounds in London on the return, I would be slightly horrified to know what the bill comes out to. You might double check if they'll debit you in US dollars instead.

Good luck and enjoy the trip!

Sean