IBM.com now lists all of the information for upcoming ThinkPad T61 and ThinkPad R61 notebooks due out in May.
Updated: the IBM pages above have been taken down, the specs for the T61 can still be found in a PDF downloaded from the T61 page however: Lenovo ThinkPad T61 PDF Specs, more specs can be found on an IBM site here
Lenovo ThinkPad T61
According to the information listed on the site, the ThinkPad T61 will have the following new features over the current ThinkPad T60:

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The site lists some example machine configurations, it appears that there are only widescreen versions of the T61 listed, an example config for the Australia region is:
There are no listings of 15.4" screen versions of the ThinkPad T61 on the site, though we would expect such a machine to be available at launch. The fact that there are only widescreen 14.1" screen options listed for the T61 is interesting, Lenovo did not do a version of the T60 14.1" in wide but it appears they're now going all out with the widescreen option.
Also interesting is seeing the Intel Turbo Memory feature being offered, this will essentially be a form of hybrid hard drive in which 1GB of flash memory will be used to supplement hard drive performance -- a nice feature given the fact Windows Vista has slow boot-up.
Lenovo ThinkPad R61
According to the information on IBM.com the ThinkPad R61 will also be offered in a 14.1" widescreen format. Below are listed the new features for the ThinkPad R61:

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Again, the site lists various example configurations for different regions of the world, an example for the Australia / New Zealand region is as follows:
Wrapping it up
So basically the story is The T61 and R61 are coming with planned availability dates of the following:
So the rollout will be gradually over a couple of months for various configurations to be available. Intel Santa Rosa and new Nvidia graphics cards will be part of the mix. The widescreen domination continues, as Lenovo has now shifted to making this the first release for their new series. Other new features include Intel Turbo Memory, a rollcage for the lid, Blu-Ray available in the R61, integrated media card reader and FireWire. For more information on everything from warranty to heat and power dissipation just visit IBM.com:
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