Following the updates to MacBook Pros (February 2011) and iMacs (May 2011) that brought support for Thunderbolt and new Sandy Bridge processors, AppleInsider relays a report from analyst Shaw Wu with Sterne Agee claiming that all the remaining Macs that didn’t receive an update will be refreshed in the “upcoming months.” These updates include new versions of the Mac Pro, Mac Mini, MacBook and MacBook Air.

Analyst Shaw Wu with Sterne Agee issued a note to investors on Wednesday claiming that all Mac products that have yet to see a refresh this year are “due for refreshes” soon. In his note, Wu told investors that Tuesday’s iMac refresh stands as “a worthy upgrade” and should help “reinvigorate” Mac’s desktop business, which has declined to 27 percent of Macs shipped. Sales of Mac desktops actually dropped by 12 percent year over year last quarter, compared to 53 percent year over year growth for portable Macs.

The report of a refresh for the original MacBook is particularly interesting, as the model was rumored several times in the past to be heading towards discontinuation, leaving the MacBook Air as the entry model in the Mac family. However, Wu seems to believe that Apple is considering an update for the line that was last refreshed in May 2010. The Mac Mini and Mac Pro were updated in June and July 2010, respectively, whilst the popular MacBook Air line was unveiled with an all-new design last October at the Back to the Mac event. Speculation in the past weeks pointed at a refresh for the Airs soon to enable Thunderbolt support and bring Sandy Bridge CPUs on board, possibly in June.