It won't be added initially it seems. Last year the airport included this paragraph in its press release regarding the new walkway/pier.
The design of the new facility takes into account the latest generation of twin-engine, wide-body jets, such as the Boeing 787 and Airbus A350, with provision made for the addition of an airbridge for passengers boarding potential long-haul flights in future.
Next phase of development begins at Bristol Airport ? Bristol Airport
On another topic, it's now been confirmed in the local press that the new hangar being built on the south side is to accommodate the £40 million Gulfstream of vacuum cleaner multi billionaire Sir James Dyson.
http://www.bristolpost.co.uk/Jet-set...ail/story.html