I suspect that Triumph sees the MV Augusta 675 as close competition for the Daytona (if they get the MV handling issues sorted out), but a wider bore/shorter stroke engine usually results in some loss of low-end grunt; there is always a trade-off.
-IMO the Street Triple has the perfect engine for real-world riding in the twisties; with close to 100 hp going to the rear wheel in a 400 lb bike gassed up, mine easily hits 100-110 mph just rolling on the throttle in 6th gear from corner to corner on a 50 mph back-road. Here are the top gear roll-on times for the Street Triple and some sport bikes (Cycle World mag);
-2012 STREET TRIPLE R 40-60 mph; 3.3 sec, 60-80 mph; 3.6 sec
-2012 MV Augusta F3 40-60 mph; 3.6 sec, 60-80 mph; 3.9 sec
-2011 Daytona R 40-60mph; 3.5 sec, 60-80 mph; 3.8 sec
-2011 Kawasaki ZX10R 40-60 mph; 3.9 sec, 60-80 mph 3.7 sec
-So if the 'new' engine trickles down to the Street Triple, it had better not be at the expense of the superb top gear roll-on power. On the street high peak power is not as important as a strong powerband and the reason the Street sells so well, and it still gives an impressive top end rush to the redline. - Wayne