Looks as though the new owners of this shop realised that the grand re-opening was going to take longer than they had first thought.
Originally a suffix used with times (five-ish) and colours (greyish), -ish can now be applied to almost any adjective to make its meaning more approximate.
Ish has also become an independent word used to indicate doubt or uncertainty:
– Did you enjoy the movie?
Location: St Benedict’s Street, Norwich, Norfolk, UK