The Cylon Empire, like any race, does not sit still in its advancement. In fact, the Cylons, being mechanical beings, have the ability to upgrade themselves at a faster rate than normal organic beings. Obviously, there are other reasons for advancement to take place, such as the need to eradicate a race that will not let itself be exterminated.
As such, over the next few yarhens some changes will start to appear in the Cylon race.
For a start, the Cylons had adopted the humanoid look (two arms, two legs) as they believe it is currently the most practical form in the galaxy. Thus, Cylons starting to look more and more human will appear, and - certainly with the IL series - they will start to act more and human as well. This will help them to exterminate any humans that are left in the galaxy by then as Cylon warriors will be able to infiltrate human society. By 7361, the first human looking Cylon prototypes will start to come off the assembly lines.
The current IL series will continue to get smarter and upgraded. Centurions may not see so much of an improvement other than they'll start to get tougher and faster. They may not see much in the way of an intelligence boost though as it may not be deemed worthwhile. They are countless millions of Silver Centurions in the galaxy, and the task to upgrade them or even scrap them would be mammoth.
Military hardware will be improved, but like the Silver Cylons, this will be a long slow job. Recently, the Foxbat Raider has been introduced to the Cylon Navy, but this will take a long time before it is the standard fighter craft of all ships and bases. Baseships themselves would stay in service for a long while yet. They would be upgraded with better power plants, engines and weapons and would remain a potent yet slow, force to be dealt with. In fact, while the Foxbat is being issued to front line troops, better improved ships will be in the development works.
The big thing with the Cylons is that they do not like waste. As a result of this, a lot of older models of Cylons and equipment will continue to see service until there comes a point when it can no longer perform at expected levels. Raiders will continue to fly missions until there comes a point when it is pointless to take off in them (some people would argue that that time has already come!), Centurions will function until destroyed and so on. However, just because the Cylons abhor waste does not mean that they are stupid. Older models will have more of a backseat role in the Empire, garrisoning backwater planets and stations, being defended by obsolete equipment.
This is just something to keep in mind if you are playing in a campaign set 20 yahrens after the Exodus.