It is not related to the Eastern Front patch. Relic's servers are having some troubles, by the looks of things.
A combination of Eastern Front's release and a 'coincidental' sale on many different digital distribution websites has led to record numbers of players on Relic Online, which wasn't built to expect such a large influx. Simple as.
How long do you think it will be until we can log back in... also why isn't there an offline system where you wouldn't need to log in.