Dutch newspaper De Telegraaf reports that Aston Martin is interested using Lexus engines to power future models.
The LFA’s V10 is mentioned specifically, though I would be surprised to see the Yamaha-built engine in anything other than a Lexus. Also suggested is a V8, and although an exact engine isn’t specified, the best guess would be the IS F’s 416hp 5.0L .
(The two companies do have an existing relationship — Aston Martin currently sells a modified version of the Toyota iQ city car, and Toyota President Akio Toyoda & Aston Martin CEO Dr. Ulrich Bez have raced together at Nürburgring in the past.)
[Source: De Telegraaf (Translated to English)]