Will we get another Expansion Pack later on this year?

I would usually say no. But things may change if TS4 is near its end just like TS3 was in 2012-2013.

In 2013 EA released:
2 SPs
4 new worlds in the store
3 EPs
No less than 6 new collections which all were combinations of the Sims 3 basegame with one or more EPs.

This was extreme and a lot more than EA usually released in just one year. But the reason probably was that EA planned to release TS4 in 2014 and knew that many simmers would hesitate to buy TS4 at least until it got some packs. TS4 was necessary to release anyway because TS3 had become way too big for new simmers to get started with. But then EA needed to release more for TS3 such that the experienced Sims 3 simmers still had something to play with until TS4 had got a few SPs, GPs and EPs released too.

Now EA has the same problem again if EA plans to release TS5 next year (or in 2020). Therefore it will make sense to me if EA again wants to release packs a little more often for TS4 until TS5 is ready to be released (and again mainly targeted at new simmers).