The 5D specs were posted on this site previously and appear to be accurate, except for the price which is estimated at US$3299. That's ground breaking for a full-frame camera. I'll be pre-ordering one as soon as I can. What's really great is that the 5D's focusing screens can be replaced, this was a major bugaboo for me with the 20D/10D since I like to have have grid focusing screens for alignment and composition.
The EOS 1D Mark IIN has the same 8.2 megapixel sensor as its predecessor, which was designed for photojournalists who needed fast frame rates more than they needed megapixels or full-frame sensors. The main difference is the larger LCD panel on the back and a larger and faster buffer performance. It'll be listed at US$3999.
Rounding things out are some new lenses. Canon announced an EF 24-105mm f/4 L IS USM lens that looks to be very juicy. It looks like Canon wants to create a new line of f/4 L lenses at a lower cost and lighter weight from its current f/2.8 L lenses. This is smart especially since the new crop of digital SLRs have extremely good low-light performance.
A new 70-300mm f/4.0 - 5.6 IS USM was also released. This is good because the current 75-300mm IS was never a great performer with consumer quality optics and first generation image stabilization. The new 700-300 unfortunately has a micro-USM motor instead of a ring USM. Let's hope it performs better than its predecessor.
There's also a new Speedlite 430EX which is slightly more powerful (GN 43 versus 42) and quite a bit faster in recycling compared to the 420EX. I also like the new, more organic styling.
As of August, 2005 with the announcement of the 5D and 1D Mark IIN, the Canon Digital EOS product tiering now looks like this:
1Ds Mk. II
1D Mk. IIN
350D/ Digital Rebel XT
Update 2005.08.22 2:00pm EST: I called B&H up to ask them to put me on the pre-order list for the EOS 5D. In their charming New York way, they told me that they weren't accepting pre-orders and didn't know when they would be making up a waiting list. I'll give them a call in another week. If anyone knows of a retailer who is listing the 5D, I'd be very interested to know.
Update 2005.08.25: Rob Glabraith also has a nice preview article of the 5D on his site.