I've been keeping track of this for a bit now. I've been a little cautious to say anything unless I am pretty sure of what's going on. I believe Playmore is once again testing their netcode for their upcoming title and KOF XIII on XBL has been nominated.
To start with the netcode we have been playing on is a variable lag style netcode. Meaning the game can change the variables (Speed of match, input delay, etc) any time they want to. Now the better netcodes that use this like Capcom have limitations on how and when it should be changing variables. KOF XIII, from what I can tell never did. So what you get is a netcode that you can never feel comfortable on cause the variables are in a constant state of flux.
I noticed at the beginning of June everything seemed calmer to play. I could actually read jumps and distancing really well compared to how I usually do. I thought maybe I am just getting used to the lag. However when I play the PS3 version I find I have the same problems as before. I tried 3 different joysticks to make sure of this.
From what I could tell Playmore was experimenting with a Capcomesque type netcode where it wasn't changing variables at will but had certain stipulations to when it can change them. The feeling I got from it was similar to 3rd Strike OE. Not to sound crazy I wanted to test more and every time I played on the 360 it felt stable. Every time I played on the PS3 it was unstable no matter the bars.
Now just this past weekend (EVO weekend) I saw another change. This time is feels like a static netcode (meaning it will not change variables unless it positively has to causing a type of slowdown when it does since it has to fix the problem quickly). The new change I saw a 4 different players in about 30 or so matches was when there was a significant change the game would slow down like a 2 bar match (I was playing 1 4 bar matchup and 3 3 bar matchups) this lasts for about 10 seconds, then the netcode would stabilize. This happened on two separate days the exact same way every time.
Now I am not 100% saying this is an update, but seeing that I am seeing updates for KOF XIII more frequently (this could be a random xbox netcode update) and I am experiencing a significant change of game experience on the 360 while having the same experience on the PS3 I am leaning toward the idea that Playmore is at work on the netcode.
Before you ask why wouldn't say anything about it I think it has more to do with testing netcode for the next game rather then helping KOF XIII out. On top of this I believe they have no intention of updating the PS3 version and saying hey we're fixing KOF XIII might piss off half your fanbase if you're not fixing the other system. This happened before with KOF 02UM testing the netcode for KOF XIII.
Just thought people might want to know about this.