I am not sure if it is coming this fall, especially after the announcement of all those games yesterday, next year is certainly a possibility
If they did go no UMD drive, they would have to give some way that old users to write to HDD or connect both their PSPs (1 & 2) to a computer and have it be transferred across
SCE have already announced their intention to have every first party game on the PSN, so DD is obviously the direction they are taking PSP