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http://www.dpreview.com/news/1008/10082620canoneos60d.asp

Canon EOS 60D DSLR announced and previewed
Thursday, 26 August 2010 04:00 GMT

Canon has unveiled the EOS 60D mid-level DSLR, replacing the EOS 50D. However, following the launch of the EOS 7D, the 60D has been repositioned in the market, so isn't a simple upgrade to its predecessor. Instead the 60D is a smaller camera featuring an articulated screen and plastic body shell and utilizing SD memory cards. It combines the 18MP CMOS sensor and 1040k dot 3.0" LCD from the EOS 550D (Rebel T2i) with the AF system from the 50D. Meanwhile it gains the 7D's HD movie capability. We've had a chance to use a pre-production 60D so have prepared a hands-on preview, including sample images and movie

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every change seems target on the D90 line............
plastic body
SD card
HD video
remain higher level in control

[Ref54]

It seems that 60D is the continuation of 550D rather than 50D....
Maybe Canon move up the product line and use 7D as the continuation of x0D series APS-C DSLR.