Re: Wait for Ivy Bridge or buy current Dell XPS 15?
There are some features of Ivy Bridge that might be worth the wait/cost. Prime among them is integrated USB 3.0 support (the current XPS uses an add-on chip, which means you can't boot from a USB 3.0 device in USB 3.0 mode).
That said, if you're going to need the system in the near future, note that new launches come with delays - though Intel will release IB within two weeks, widespread availability may be some weeks or months off. Witness what happened with the Intel Cougar Point chipsets for Sandy Bridge, for instance.