I use the Ruby Plugin with IntelliJ IDEA 13 EAP. It was just updated to RC1 (133.79) and now the Ruby plugin will not load - it is limited to build 132.*. Do you have any info regarding timing to get the ruby plugin working with this lastest build?
PS: the debugging support in the ruby plugin is extraordinary. It has been years since I tried to debug Ruby - in the past it was incredibly painful. Debugging in IntelliJ/RubyMine is incredible. Great work!