In an interview with teltarif.de (a german telco online-magazine) the CEO of United Mobile Charles Fränkl announced some upcoming features:
1) by the end of this year they will offer also SIM cards with german numbers
2) next year cards with russian numbers will follow.
3) the GPRS data for ICQSIM will be expanded to about 30 countries within this year
4) data will also be made available for existing +423 customers within the next 6 weeks
5) sooner or later they will offer all services on one card
The whole article in german language can be found here:
http://www.teltarif.de/arch/2008/kw06/s28746.html
Chris