Looks like the HR Market is ripe for new disruption! According to a recent research, 25% of firms are in the market for a new HR System, replacing the age-old legacy systems that have previously been in place.
The biggest disruption is probably going to be in use of Mobile and SaaS, and here is an article from Forbes listing the hottest trends in HR.
It will be interesting to see how Open Source HR Software firms will respond to this. At least a few vendors, A1 eHR, OrangeHRM, have already started their SaaS and Mobile offerings and only time will tell how well they will perform in this market.
But, considering that most open source hr software has only come of age recently, it would be fair to say that they should adapt a lot easily than the entrenched vendors who have to migrate their legacy clients to new technologies.