If the MBP was built after Feb. 2011, yes it can take the 8GB DIMM modules for a total of 16GB RAM. Apple does not state them as compatible since that type of modules were not widely available for certification when the Macs were designed, and they never go back to recertify already released models. I'm sure that any new model that comes out this year will probably take that new RAM option in consideration.
The question that remains is whether you NEED 16GB of RAM, other than for bragging rights. With MacOS X 10.7 Lion, a full 64-bit OS, 8GB are very recommendable. But to actually need 16GB would mean really pushing the envelope with heavy duty stuff such as virtualization, video processing, graphics rendering, etc. Note that an 8GB upgrade can be had for around $50, a 16GB upgrade for around $200; the technology is still fairly new and prices are still high.
BTW, those prices are street prices. Buying RAM from Apple is a Bad Idea. The 8GB custom option at the Store adds $200 to the base price and they will not sell you a 16GB option.
Hey thanks a lot Courcoul! I've heard it from my friend that he did the memory upgrad to 8GB but said many of his friends installed up to 16GB RAM to their MBPs, so I really want to make sure that it will work for this kind of configuration. Now that I've got the answer, I'll go ahead with my MBP purchase. I do need as RAM asossible, cause I will use this MBP to do a lot of HD video editing/rendering stuffs.
Like I said, RAM from Apple, Bad Idea. Same applies to the HDD. What you will want to invest in is the widescreen option so you can order the anti-glare finish. As for the CPU, note that the 2.4GHz gets you the meaner GPU + 1GB VRAM == faster graphics and better performance if you later attach an external display. But the 2.5GHz option seems way overpriced for just a piddly extra 100MHz; better invest that $$$ in Aperture & other SW.
Good luck & enjoy the new toy.