Technically, Apple showed off Lion last year and is going to release it this year. Microsoft is showing off Windows 8 this year and is going to release it next

Technically, Apple showed off Lion last year and is going to release it this year. Microsoft is showing off Windows 8 this year and is going to release it next year. Nonetheless, this near-overlap happened around the time of Win 7 and Snow Leopard too (both released late summer 2009).