Alright so ive been looking through some information on checkpoints and how to get them working. I got it figured out and figured ill make a short little tutorial. I know theinterlock is working on a video for this but i coudnt wait sorry. lol. I also ran into a few bumps along the way that im gonna try to clarify. So you already got your map all made and done but you load the last checkpoint and it either crashes or all the AI characters are dead and it wont fire off kismet sequences. So the first thing you need to do is go under the levels tab under the generic browser. Select level new level and click your level. now rename it to something else or something similiar like ex: hammer1 to hammer2. Now you should have two levels on your current hammer1 map. Now go into kismet of the hammer1 map (persistant level) and go under action>level>stream level. Under the properties of stream level change the level name to your new map for ex:hammer2. Should look like this.

Half of the battle is done. Now that this is done. Go back to the levels tab under the generic browser. Double click the new map, now go to the actor classes>navigation point>path node> war checkpoint. Place it on the map. Next create this sequence in kismet on THE NEW MAP. Should look like this. Make sure your new map is visible.

Thanks to the interlock for that sequence i believe he is the one that figured that out. So i give him credit for pretty much this whole thing. One last thing, you wont be able to play the game in the editor and have the checkpoints working. It will just crash. So cook your map. Make sure the map is placed in Mydocuments/mygames/gears of war for windows/wargame/unpublished/cookedpc/CustomMaps. Save it as a different name in that directory. That got me stuck and i coudnt cook it right. :/ Make sure to move both of your maps in that directory both hammer1 and hammer2 as an example. Cook both of them seperatly. Start gears of war up type ` open mymapnamehere Then your game should run and have working checkpoints. As for my last post on cooking maps that can be deleted lol i figured it out.
This video should help many of you out. Once again by theinterlock.
http://es.youtube.com/watch?v=fYcYXQ9O0EQ