This also happened with iOS. The Imperial item build times are generally longer and not as clustered. That is, previously there were a bunch of different items with the same times (55 minutes, 1:05, 1:25, ...) and now they are more spread out, including some rather long ones. The longest are in the Superlaser Ray level (5:20 for "Cooling Coil", and 8:40 for "Blaster Rifle") which were both previously around 2 hours.
In the update two major revisions ago, the Superlaser Ray was also the longest, with 5:20 for the single item available then. So it appears that they have reverted to those times for the first item, with longer times for the newer second items.
Edit: the costs associated to Imperial item building have also changed, apparently in proportion to the time required.
Second edit: the costs have changed again with the most recent update (data 1.4) of about Feb 23rd 2014, and the costs and times are now less extreme than they were for a while there.