Please - no card/memory stick reader slots in future Mac laptops. Ugly, and they just get obsolete. And which slots to include? It's never been a problem finding a small external card reader fairly cheap.
I'm thinking the future of Apple laptops is about all SSD storage, all multi-core (4/8/16 core) Apple-designed cpus and internal architecture, Hi-def 16" (OLED) screens for the intermediate MBP (available in non-glare configurations,) a 13" Macbook Pro w/discrete graphics, (1440x900 OLED also w/non-glare option) - modular gpu, not hard-soldered, and FW/expresscard slot, 8-10 hr. battery life, wireless recharging (yup,) carbon graphite construction, increased multi-touch, including touch screen capability. Also, future versions of HDMI probably will show up, but not right away as long as Apple is pushing the displayport/mini display port. I'm sure we won't see most of this real soon... but technologically it's not really much of a stretch.
I don't quite see the need for built-in Blu-ray. For viewing HD content on your laptop and home entertainment center, downloaded files are certainly the future, agreed. External blu-ray burners can make sense for data archiving or HD video authoring, but why carry it around. Maybe Blu-Ray player capabilities for the

TV might be worthwhile, though, because most downloaded HD content is not as good as Blu-ray - most is still 720p, and even the 1080p content is generally compressed to the point of some visibility. And it would get rid of one more piece of equipment, the current Blu-Ray player connected to your TV. The only place I can see Blu-ray really mattering in a laptop is gaming... and Apple will probably explore the idea of jumping into that (gaming) with a new console incorporating the

TV with Blu-ray, and an embedded hybrid OS X waiting in the wings to be unleashed.