Is it possible that IS is just taking advantage of these recent events to spread more terror?

there is always that possibility but there is credible evidence that Daesh (ISIS/ISIL) has moved to Egypt and Libya. Tunisia authorities are already claiming that the gunmen were trained in Libya which the AFRICOM Commander reported that there are Daesh training camps in Libya. Take into account that a senior Tunisian Daesh leader was killed in Libya, this could have been seen as retaliation and open another African front for Daesh. Even the White House is now admitting that the TTPs of the Tunisia attack are hallmark of Daesh.
http://www.aa.com.tr/en/news/481078--tunisia-attack-method-consistent-with-daesh-says-white-house

That is truly a great concern these days. We really just don't know who is who, and every group wants the credit for the deaths and destruction. Me, all I see is terrorist no matter who takes credit. Eliminate them all, PERIOD!

Yes it truly is possible, and from the ISIS/ISIL perspective, the more attacks (especially large scale) they can relate to and/or claim responsibility for the more credible they become when they threaten cities/villages.