If we get a Spit One and a '09e...  BOB will be great in the CT.   The only way you can spoil it is to have the fields too far apart or..   Make it a "hurri vs 109 arena" and perk the "uber" Spit One.   
Huge Battles over the channel could be a blast.   The new early planes will certainly increase CT attendence.   I would fly CT during BOB times if the fields are close enough to get into a fight in a reasonable time.   
The early war planes will be slaughrtered in the CURRENT MA and within a short time... No longer used.   the only place to fly em with any parity will be the CT and then, only during those times that a BOB scenario is on.  The BOB is one of the few "historical" times that there is parity in the planeset.
lazs