Yes, I think it is time for a 4" model. I hope SYK will sell it with a sheath. If not, I'll pass. All knives that require a sheath for carry should be sold with one that fits it properly. A nice little kydex would be perfect for a 4" knife, but a well made cordura or leather would be fine with me. The 4" to 5" blade knives are very useful. I hope it is not over 3/16" thick.