Here are the links for iOS 6.1 (10B141/10B143). The exploit that is used for the coming jailbreak is present in the release 6.1, so you should be safe to upgrade. If you use a software unlock, you may want to avoid it for baseband reasons though. There are a number of new iPad 2 and 3 models in this list as well.

iPod Touch 4G – iPod4,1_6.1_10B143_Restore.ipsw
iPod Touch 5G – iPod5,1_6.1_10B143_Restore.ipsw

iPad 2 WiFi – iPad2,1_6.1_10B143_Restore.ipsw
iPad 2 GSM – iPad2,2_6.1_10B143_Restore.ipsw
iPad 2 CDMA – iPad2,3_6.1_10B143_Restore.ipsw
iPad 2 Refresh – iPad2,4_6.1_10B143_Restore.ipsw
iPad 3 WiFi – iPad3,1_6.1_10B141_Restore.ipsw
iPad 3 GSM – iPad3,2_6.1_10B143_Restore.ipsw
iPad 3 CDMA – iPad3,3_6.1_10B143_Restore.ipsw
iPad 2,5 ??? – iPad2,5_6.1_10B141_Restore.ipsw
iPad 2,6 ??? – iPad2,6_6.1_10B141_Restore.ipsw
iPad 2,7 ??? – iPad2,7_6.1_10B141_Restore.ipsw
iPad 3,4 ??? – iPad3,4_6.1_10B141_Restore.ipsw
iPad 3,5 ??? – iPad3,5_6.1_10B141_Restore.ipsw
iPad 3,6 ??? – iPad3,6_6.1_10B141_Restore.ipsw

iPhone 3GS – iPhone2,1_6.1_10B143_Restore.ipsw
iPhone 4 – iPhone3,1_6.1_10B143_Restore.ipsw
iPhone 4-2? – iPhone3,2_6.1_10B143_Restore.ipsw
iPhone 4 CDMA – iPhone3,3_6.1_10B143_Restore.ipsw
iPhone 4S – iPhone4,1_6.1_10B143_Restore.ipsw
iPhone 5 AT&T GSM – iPhone5,1_6.1_10B143_Restore.ipsw
iPhone 5 Verizon CDMA / International GSM – iPhone5,2_6.1_10B143_Restore.ipsw