It has been well documented that the release of 76039 Ant-Man Final Battle was briefly delayed earlier this month for reasons unknown until now. The finalised set has now been released worldwide so, with both versions of the set available, the differences between the two have been identified.
The legs were criticised in early reviews of the set as they were liable to buckle if excessive pressure was applied from above. That issue has now been rectified with the addition of two extra pieces to each leg which greatly increase their sturdiness; a short Technic axle and a cone. You can see the change shown in the instruction manual above. The box on the other hand has not changed so North American versions still show a piece count of 183 and the set images still show the set's original design.
We will have to wait and see whether the value of the original set will increase given its very limited release period. For the most fervent of Super Heroes collectors it might be a nice curiosity to own but given that only the instructions are truly exclusive I don't think the appeal will be substantial.