I entered in each of the last two years & from experience the tougher standards set in 2013 had a marked change.
I am V55 & for 2012 the BQ was 3.45 but you were also given another 60 second grace so effectively 3.46. However there was a early entry period for those with times faster than the BQ. I can't remember exactly but say more than 20 mins under the BQ were given a few days start then those 10 mins under another few days. Effectively all these were guaranteed entry. Finally all others with BQ were given a few days to enter. During this period more entries were received than places and a cut-off established, which ended up being something like 3.44.30. My time in Madrid was 3.45.40 so missed out on a place. Entries were filled within the initial entry period
I ran Berlin last Sept on a date which was about 3 weeks after Boston 2013 entry opened. MY BQ had been tightened to 3.40 without the 60 second extra. I hoped to get a BQ and expected Boston 2013 to be full so was goin go use the time for Boston 2014 (Berlin 2012 was right at the begining of the qualifying period). However when I got home I checked and discovered that 2013 was not full so entered for 2013. I cannot be exact but I think it took more than 4 weeks for all places to be filled
Unfortunately I got injured in January but rather than let my place and travel plans go to waste I ended up walk / jogging in the 8 weeks up to the race and basically walked most of Boston. I was on course for a 5:30 finish but obviously got stopped at 25.5 miles.
My Berlin time qualifies me for 2014 but like all others who could not complete 2013 will be given a guaranteed early entry slot.
Whilst undoubtedly Boston 2014 will be popular the BQs are quite tough so this limits the potential entry. What might make soem difference in entry is the carry forward of the 2013 entries (about 5 - 6000 I think) but most of these will have BQs anyway.
In reply the 3 previous postings, my thoughts are:
any recognised marathon is OK for BQ as long as you can send a link to verify your time.
I suspect 3.06 for 3.10 will probably be OK
I would be very surprised if a time 15 minutes under the BQ is not good enough. Book your hotel now!
I will be back in 2014 for my third attempt at Boston. Regardless of this years events I think it is my favourite marathon. The whole event is very special