the re-intstatement of Valencia (not technically a new route) is good news - although at a lower frequency (3 per week) than in summer 2005 (5 per week) And the continuation of Prague at 5 flights per week in the summer 07 season is great news.
I really doubt Pisa will be run in 2007 - they will not be able to compete with Ryanair.
However this does not warrant an additional aircraft - the utilisation was not at maximum for the two aircraft based at BOH this summer, so the new frequencies will be squeezed into the existing fleet. It will mean more profitable operations if anything, so a good move.