Go to http://buyersguide.macrumors.com/ to see a list of Apple products and when they were updated. There is even a recommendations based on that product's update history for 'buy now', 'don't buy', and 'it doesn't matter' (i.e. halfway to the next update).
Expecting a revision is tricky - it may get a Merom, or it may just stick with Yonahs for a while. But the Macbook Pro will be updated first (within weeks). It could be updated at the same time, or it could wait weeks or months.
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Go to http://buyersguide.macrumors.com/ to see a list of Apple products and when they were updated. There is even a recommendations based on that product's update history for 'buy now', 'don't buy', and 'it doesn't matter' (i.e. halfway to the next update).