I don't know if Apple has plans to release anything on November 5th, so I can't speak to that. But I did want to address the concept of a 13" wide-screen iBook.
Biggest positives for the 12" iBook: Compact size, awesome screen clarity.
Biggest complaints on the 14" iBook: Too bulky, 1024x768 max resolution.
We all assume Apple sells more 12" machines than the 14" ones. And though it seemed like a good idea on paper, 14" has overall been a flop for mother Apple, coming out of her womb like a fanged beast.
So Apple should look at the success of the 12" and start over with the next revision of a larger-screened iBook. I feel a 13" wide-screen iBook is perfect, for a wide (no pun intended) variety of reasons.
First, let's look at current Apple LCD-based products:
15" PowerBook G4   - Currently wide-screen.
17" iMac G4 LCD    - Currently wide-screen.
15" iMac G4 LCD    - Speculation says discontinued shortly.
15" Studio Display - Officially discontinued.
17" Studio Display - Could be replaced now by iMac 17" wide-screen.
19" Studio Display - Rumored to be coming soon...and wide-screen.
22" Studio Display - Currently wide-screen.
23" Studio Display - Currently wide-screen.
See a pattern here? Apple clearly loves the wide-screen concept. They focus on iMovie/iDVD/SuperDrive as major selling points. So to turn the entire Apple LCD lineup into wide-screen across the board would be a major coup for them.
The poor iBooks stand out as being non-conformists with their very "outdated" square screens. So it's perfectly logical to believe that a wide-screen iBook DOES fit into Apple's product vision. And if done right, it could replace BOTH the 12" & 14" iBooks simultaneously, cutting Apple's production costs.
So with all that out of the way, let's address this theoretical 13" wide-screen iBook:
1 - Compact travel size like the 12" iBook:
Current 12" iBook:   11.2" Wide / 9.1" Deep / 1.35" Thick
Current 15" TiBook:  13.4" Wide / 9.5" Deep / 1" Thick
With the measurements above, we see that the TiBook is 2.2" wider than the iBook, but only .4" deeper. NOW...imagine an iBook shaped like the TiBook, but with a 13" screen. What would happen to the size? It would be both LESS WIDE and LESS DEEP than the current TiBook. Even leaving room for more bezel around the screen to keep it more rugged, the math tells us this new iBook would have to be less deep, and only slightly wider than the current 12" iBook. No one could say that such a machine would not be compact. And it would even further make the 14" iBook look like the behemoth that it is.
2 - Increased resolution over the 14" iBook:
Current 12" iBook:  1024x768 Max Resolution
Current 14" iBook:  1024x768 Max Resolution
Two machines...one with a 2" larger screen. SAME RESOLUTION. If the issue for buying a larger screen is eyesight, it may not matter. But if you wanted a larger desktop area, no such luck.
Now what if we have a 13" iBook and 15" TiBook. Just like the above...2 machines, one with a 2" larger screen. Theoretically, Apple could give that iBook the same resolutions as the TiBook, with a maximum possible of 1280x854.
However, in order to differentiate between the more expensive PowerBook, and possibly due in part to a less powerful graphics chip, let's say 1152x768. (That is what the TiBook originally had before the jump to 1280x854, which was a 23% increase.)
So even if we assume 1152x768, that gives us a 12.5% increase in desktop space over BOTH current iBooks, in a package easily smaller than the 14" iBook and arguably only slightly wider than the 12" iBook. With a pixel density guaranteed to produce the 12" sharpness and clarity many gush over.
Frankly, a 13" wide-screen iBook would kick all previous iBooks square in the nads. If we get 32 MB of VRAM...even better. If the TiBook hits 1 GHz with a G4 and we can offer an 800 MHz to 1 GHz G3 Sahara chip...even better still. But I hope all the nay-sayers claiming Apple would never build this machine are wrong. It would have all the same distinctions between it and the PowerBook that today's iBooks have. But even changing NOTHING but the screen, it would be a far superior machine to either current iBook offering.
IMHO, of course...