All the links about this form Anandtech/Dailytech
http://www.anandtech.com/cpuchipsets/showdoc.aspx?i=2915
http://www.dailytech.com/Life+With+Penryn/article5869.htm
http://www.dailytech.com/article.aspx?newsid=5657
According to Wiki Penryn will be for Laptops and there will be to variations Yorkfield - Quad Core and Wolfdale - Dual Core both based on the 45nm.
Intel Core 2 Quad (Yorkfield) CPU is expected to be released in Q3 and is expected to be based on a 45nm process. Yorkfield will be the successor to Kentsfield and feature two 6MB L2 caches (one cache for two cores), making a total of 12MB L2 (2x6MB). Yorkfield is also expected to feature the 50 additional Penryn New Instructions (SSE4) and feature a clock speed of 3.46 to 3.73Ghz. Yorkfield will be paired with the Bearlake chipset family and will feature a 1333Mhz or 1066Mhz FSB speed.
Intel Core 2 Duo (Wolfdale) desktop CPU is expected to be released in Q3. Wolfdale is the Dual Core version of Yorkfield based on the Penryn core and featuring 6MB of shared L2 cache running on a 45nm process. Wolfdale is expected to feature clock speeds of up to 4Ghz and can run on a 1333Mhz or 1066Mhz FSB speed. The TDP of Wolfdale is expected to be 57W.
I like the look of the 57W TDP and the 'up to 4Ghz' on the Wolfdale.
As you can Intel are planning on a schedualed die shrink and new architecture for nearly each die shrink they do.