Zavvi do have a history with listing errors, but they have also been known to let "cat's out of bags" - so take the following with a pinch of salt.
Two new Diamond Marvel Select listings have gone up on Zavvi, both pre-orders with an ETA of August 2016. The first is for a Marvel Select Carnage, a figure we know is being re-released in 2016. The second listing is for a Marvel Select Hawkeye figure.
Both are priced at £29.99, so overpriced vs the RRP, and neither have any description or imagery. Zavvi have been known to order in older models so this may just be an order of Classic Purple Hawkeye - they did that recently with Black Cat and Storm.
So it is most likely nothing, it may be something, either way it's worth keeping half an eye on to see what happens.