Like many, i think we will see some nice changes during WWDC.
my personal predictions are that during WWDC, uproar will happen as the line between macbook and mbp become even thinner, a separate event will happen during the last few months of the year where the mbp will shine in all its glory with a new design to increase the mb and mbp gap.
i'm sure apple are thinking of re designs..they cant possibly stick to their current designs for much longer, the halo affect will disappear soon.
What you describe is a very good strategy. Are you in marketing or something? LOL! Seriously though, it would be better for sales to release a new MB design at WWDC (or around that time), boosting the MB hype and sales. Then later this year, just as the sales peak, release an new MBP design, and whoosh, watch the sales go up again.
And as someone stated before, Mr. Jobs has the GreenPeace guys breathing down his neck to go all-aluminum, reportedly by the end of the year.