>>At least the pics I've seen of the 400 so far look identical to the 600.<<
Pretty much, although it may be a different engine, not sure.
>>Keep in mind the GSX600F Katana has a MSRP of $6399 vs the MSRP of the GSX-R600's $8799 - that's a $2400 difference. The difference is even greater with the 750's! The Kat comes in at a mere $6999 vs the GSX-R's $9999.<<
True, but I deliberately compared bikes with the same displacement. If you look at the SV650, you have a more modern bike that lists for 6 grand and weighs 363 lbs dry (or 372 lbs for the $6500 SV650S). It's a pretty safe bet that this bike can outrun the 750 Katana, and is certainly cheaper.