I was there for the last two days, and this is what I gathered: Yes, there is going to be some sort of senior-thesis-like project required for c/o 2010, but no it does not necessarily have to be bench/basic sci/traditional research. This type of flexibilty seems to be in place all over harvard - if you give them a plan, and it makes sense, is beneficial to your medical education, and fits with their overarching intentions, then the school seems very supportive of innovative and non-traditional approaches. That being said, research would be the most straight forward way to satisfy this it seems. Also, they are adding a couple week course at the start of year one that is an intro to the profession or something like that. Beyond this, they are tweaking a few other things having to do with class content/scheduling in response to student input, just like they have done in the past every few years.
To your second question: In general, having research experience can definitely help you. Since medical advancements come from research, it makes sense that med schools look for it in their "ideal well-rounded premed" or whatever. This is especially true at a bigtime research institution like harvard. By no means is this required, however, and many many students I met didn't seem to have a research background at all.