In the past, all versions of Intel processors have been named according to their clock speed, cache size, and supported features. “Pentium” versus “Pentium with MMX”. In the past year and a half, Intel moved from a clock speed and a tag to a 3-number system that signified features and type of CPU within each class, such as “Pentium D 830+”. They are adding onto
their current system for their 65NM line with the letters E, T, L and U, depending on the power consumption of the chip, with "E" signifying anything above a TDP of 50W. It used to be in order to get low-voltage processors you would specifically request them, now Intel wants you to be able to just see the letter and know. The new dual core “L” series processors, consuming a maximum of 24W (supposedly), will come from 1.66GHz to 2.33GHz. Although this is nowhere near the 5W we heard about at IDF, that was just a short time ago. Of the total 65NM line we know of so far, there are only a few CPUs making that “U” mark, with the Yonah “U1500” clocked at 1.06GHz with dual cores being the top of the pack.
As the article also mentions, Intel will again cut prices on their dual-core lineup in early 2006 after the 9xx series comes to market. The price cuts are not insignificant, upwards of 20%, and it's clear with their refocusing they want to put the pressure on AMD.