Raul Castro will arrive in Moscow tomorrow to start his week-long visit. This will be his second trip abroad as Cuba's President.
Raul is scheduled to meet with Medvedev on Thursday, informally (think Vodka shots ala-Yeltsin), and then meet again on Friday for official talks as they, or at least Raul, recover from what will likely be quite the massive hangover.
Last week, it was announced that Russia was evaluating the possibility of giving Cuba a $20 million loan, to be spent on Russian goods. I'm sure Raul will do everything he can to nail it down.
It's hard to tell if the increased ties with Russia are just a sign of the times or if they have increased because Raul is now in command. Raul has more of an affinity towards Russia than Fidel ever had.