1. Book by March 27 2013, complete your stay by March 27 2014. Any changes after March 27 2013 result in your booking being repriced at the new rates. Stays booked for beyond March 27 2014 (or more than a year in advance) are a bit of a grey area at the moment.
2. See 1. The points cost of a booking does not change after it's made, unless you ask to amend the booking.
3. Not applicable.
4. Points And Money will probably stay, but they haven't said for sure yet. VIP awards (4 nights or more for a reduced cost when booked by an elite member, which some people still refer to as GLON or Going Global awards despite the term being long obsolete) are almost certainly dead, replaced by the 5th Night Free benefit. AXON awards (4 nights at a further reduced cost for holders of particular US American Express cards) are almost certainly dead.