Who knows......if this is a centerfire,maybe it's a centerfire caliber that ruger has no history with......say, a 17 caliber barrel......17 fireball or 17 hornet or the 17 rem.....might have had production issues or quality issues and had to re-schedule or re-work the tooling.
Time will tell......i doubt ruger would intentionally let Jason twist in the wind just to hype a limited run firearm.
Since ruger will no longer produce anything larger than .308 in the RSI platform,i will stick to the smaller of my 2 wishes......223 Rem.......tho the 358 Win just embodies the RSI concept.
The 338 RCM should be considered as well......what a package for ruger.....Ruger RSI and the 338 Ruger Compact Magnum.....a classic unique platform with a cartridge bearing the ruger name.