Frog-
Capt W was a female captain when i was there, she is at another station and has been replaced by Capt. R. She was amazing, don't know much about Capt. R. I will say the SNCOs are some of the most outstanding marines I have ever met in my past 2 years since I first contacted their office. The same Gunny should still be there and is a PT animal and will bend over backwards to help someone become a marine officer if you show you want it bad enough.
Make sure you have your stuff in order and you're in psychotically good shape. I ran a PFT with the candidates-to-be after i was commissioned for about a year and about 10 of the 25 people there were running the 3 mile in under 18 minutes. It is an EXTREMELY competitive office, they have the best pick of people out of probably any Marine OSO in the country- extremely bright kids from the entire DC-VA-MD area colleges (Georgetown, George Wash, UMD, Hopkins, some UVA) who are either in military families or are exposed to the beltway military establishment.
They did a great job preparing me for OCS, had regular weekly PT sessions, briefings from new and current marine officers about what the job and lifestyle is like, tours at some of the military bases and installations, as well as review sessions for the academics of OCS. They are probably the best OSO office anywhere to prepare you for OCS, some of the candidates I talked to said they met their recruiter once or twice and just got shipped off on a plane with no clue what was going on.