They usually do. It's a common practice for them to do so, and has happened to the majority of people who send it in.
huh? knowing me, which i do, id prolly take it apart myself, which would be my 1st mistake, me + taking electronic devices apart = busted-ass electronic device!
i dunno when 6.20 was released nor if its still the most-up-to-date OFW nemore, i lost track of all the OFW when i went to 5.50 GEN but i dont think ull have much to worry about seeing as to how they dont release them that quickly id say maybe every other month, if that even but, yes, if they do release an update while its in the shop, say "good-bye!" to any/all mods/hacks u have and "Hello!" to OFW crap!