At IDF 2011, we learnt more about the Ivy Bridge processors, that will come in early 2012 with graphics that will support Direct X 11, better power management and performance.
According to a report by PC World, Ivy Bridge processors will also come with the ability to provide higher resolutions than the usual 1377 x 768 pixels. The report states that resolutions as high as 2560 x 1440 pixels are expected to come with Ultrabooks sporting Ivy Bridge processors.
As of today, all of the Ultrabooks that we've experienced only are limited to a resolution of 1366 x 768 pixels, such as the Acer Aspire S3. However, the Asus ZenBook UX31, a 13.3-inch Ultrabook will ship with a large 1600 x 900 resolution that is even higher than that found on the MacBook Air (1440 x 900).
A resolution of 1600 x 900 pixels will look nice, but at a regular viewing distance, you can still make out the individual pixels with the naked eye, when sitting about half a meter away. However at the same distance, and with a higher resolution of 2560 x 1140 pixels, those lines that separate the pixels will be indistinguishable.
This is similar to what the high pixel density retina display on the iPhone 4 (and 4S) would do for you, even when the phone is near your eyes.
So, sure the Ultrabooks that you see today are already impressive enough, but if you're willing to wait another few months without experiencing the incredible portability of an Ultrabook today, then just go ahead and wait for those juicy high-resolution Ultrabooks when 2012 comes along.