Although Thunderbolt is a technology primarily developed by Intel, Apple has trademarked it. Apple actually owns the Thunderbolt trademark, not Intel. MacNN points out that documents filed with the US and Canadian trademark offices reveal Apple is claiming the trademark, based on a filing it made in November 2010 in Jamaica.
Thunderbolt (also known as Light Peak) allows for data to be transfered at 10Gbps in both directions. The technology has been well received by users, and accessory manufactures are implementing it in most upcoming products. Apple is also rumored to introduce a new MacBook Air which would include the port. At the moment, the new iMacs and MacBook Pros include Thunderbolt, and the speed it offers is simply remarkable.
It seems that Intel will use some other name to promote the product.