UPDATE - September 23, 2010 -
Yesterday, the word went around that Sprint was delivering the calendar bug "fix" via an OTA rollout. I got mine today - it is a gradual rollout so it may take some time for everyone to get it.
I can confirm that the calendar bug I reported is fixed - it is now possible to edit an event without losing data.
Added goodies include a lifting of the 30 fps limit on video, and the ability to sync more than one g-mail account.
Having gotten used to the Jorte calendar monthly view, I'm not going to replace the widget 4 x 3 widget - I like the fact that it gives a little info about appointments rather than merely putting up a triangle to indicate something is there . . .