As Yahoo! reports, ICANN is considering selling off single letter gTLD domains: Agency Weighs Single-Letter Web Addresses.

One could wonder about the motivation, but part of the answer is already found in a quote in the article:

Meanwhile, a handful of companies have asked ICANN to free up the single characters. Overstock.com Inc., for instance, prefers a single-letter brand of “o.com” because its newer businesses no longer fit its original mission of providing discounts on excess inventory.

Funny enough Overstock.com also happens to be one of the exhibitors at the ICANN meeting in Vancouver.