It's very possible that D14 can go up with another heavy payload sat.
As DIRECTV 14 is itself a very heavy payload, it has to team with a relatively light bus (or buses). The payload capacity of the Ariane 5 ECA spacecraft is 10 tons. DIRECTV 14 is projected to weigh 6.5 tons at launch (I assume this includes the faring and fuel to get it from GTO to GEO).
Today's update from salo suggests that DIRECTV 14 becomes a bigger a question for 2014 as it is too heavy to go with the birds that are looking for a new companion (Measat 3b and Jabiru 2, launch VA218) that has been rescheduled for
NET September when OPTUS 10 (LS-1300) wasn't ready in time. The other satellite that is looking for a partner is Intelsat 30 (aka Intelsat DLA-1, LS-1300, launch VA219) that is being launched to serve DIRECTVLA and it is probably bubba-sized as well.
As it stands, Arianspace will only have done three Ariane 5 launches in almost the first seven months of 2014. The span between the most recent launch (#2, March 22nd) and the next launch (#3, July 25th) is scheduled to be 125 days!
salo's schedule has quite a few birds left that might launch after the July launch (those with VAnnn launch vehicles would seem to be in the queue):
September - Intelsat 30/DLA 1 (TBD), Arsat 1 - Ariane 5 ECA (VA220) - Kourou ELA-3
NET September - Measat 3b/Jabiru 2, TBD - Ariane 5 ECA (VA218) - Kourou ELA-3
fourth quarter - Thor 7, Sicral-2/Syracuse-3C - Ariane 5 ECA (VA221) - Kourou ELA-3
fourth quarter - DirecTV 14 - Ariane 5 ECA - Kourou ELA-3 (or 2015)
end of year - Star One C4 - Ariane 5 ECA - Kourou ELA-3 (or 2015)
TBD - Optus 10 - Ariane 5 ECA - Kourou ELA-3 (or 2015)
It would appear that getting off a 7th launch in 2014 is pushing very hard.
As Arianespace is having to babysit DLA-1 and Arsat 1 until they launch, I doubt that DIRECTV 14 is anywhere near French Guiana and if it is consistent with recent DIRECTV history, it probably isn't finished yet. The other thing that makes me think DIRECTV 14 isn't ready is that it's originally assigned launch vehicle, VA221, was reassigned in mid-May to Thor 7 (LS-1300).
This may come down to DIRECTV having to choose between DLA-1 and DIRECTV 14 going up this year.