the oct 2009 mac mini cpu was better then the current 13 inch mac book pro at that time
oct 2009 mac mini
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2.26 GHz (P7550) or
2.53 GHz (P8700) Intel Core 2 Duo
Optional 2.66 GHz (P8800) Intel Core 2 Duo
mid 2009 macbook pro
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2.26 GHz (P7550, P8400,[59] or
P7570) (13" only) or
2.53 GHz (P8700) (13" and low-end 15" only) Intel Core 2 Duo Penryn with 3 MB on-chip L2 cache
2.66 GHz (P8800) (15" only) with 3 MB on-chip L2 cache or
2.8 GHz (T9600) (15" and 17" only) Intel Core 2 Duo Penryn with 6 MB on-chip L2 cache
Optional 3.06 GHz (T9900) with 6 MB on-chip L2 cache (15" and 17" only)
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So from oct 2009 to april 2010 a mac mini could have a 2.66 GHz cpu while a 13 inch macbook pro maxed at 2.53GH/z cpu.
Source from wiki;
http://en.wikipedia.org/wiki/Mac_mini
http://en.wikipedia.org/wiki/Macbook_pro
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Based on that the hi end mini should be a SB CPU at least the equal of the current 13 inch Macbook pro ,
but as an aside the mini may not be released faster then the iMac.
Also they are not changing the aluminum design..