Arihant is a new sub. So, it will take time to mature.
Arihant isn't adversary specific, but the missile could be. A new missile is being developed called the K-4. It will have a range of 3500 Km and a payload of around 2500Kg and will be MIRV capable. This means it can carry at least 4 to 6 250KT nuke warheads. This will be the China centric missile. The current version of Arihant can carry 4 K-4 missiles.
If you want the specifications of K-4, you could read the Agni-III missile, they are quite similar. If you want specs of K-15 missile then you could read about a missile called Shaurya.
BTW, China has been making SSBNs since the '70s, inducted one in 1981, but not one has been on deterrent patrol ever. One Xia class was lost in Chinese waters too. Arihant will be making her first deterrent patrol in 2012. Even with a 30 year head start, we seem to be ahead in operationalizing our first SSBN.
1. Agni three is not MRIVed, it carries a payload of only 600-1800kg which is a single warhead and assorted decoys. India does not posses cryogenic technology, thus cannot produce a BM with the necessary power to carry an MRIVed cargo over any significant range.
2. The K-4 is an SLBM version of the Agni 3, thus it has the same limitations. The only upgrade from K-15 to K-4 will be in terms of range, which is commendable all the same.
3. The JL2 on the other hand, has a range of between 8500km and 14000km as listed by wikipedia, thanks mostly to a liquid fueled second stage and chinese cryogenic technology.
4. The JL2 whilst lacking official releases, is argued by many experts to be MRIVed as it has the necessary power to actually lift multiple warheads and the nose cone shape, which is consistent with MRIVed missiles.
5.So you're saying that the Chinese have been building SSBNs for almost 40 years and in all this timpe they've just been in harbor collecting dust? The money spent building and developing the JL1, improving it, designing and building the Xia, puting it in production, developing the type 094, which by the way is China's most advanced submarine, and is still in production, and developing various variants of the JL2, was just so they could sit in habour and haven't been out on patrol EVER?!!!
I'm sure you realize how ridiculous that sounds. Not to mention the various submarine bases and numerous sub tunnels, whose sole intent is to hide our SSBNs and SSNs from prying eyes, and so they leave and return for patrols submerged, undetected.
So in conclusion my Technocrat friend, China has been running nuclear sub patrols for decades, and is FAAAAAAAAAAAAR ahead of india in nuclear sub technology and operation, AND balistic missile tech. China has land based and Sub launched ICBMs, what India has and is developing right now in the K-4 and Agni iii are just intermediate ranged, non-MRIVed BMs, and it'll stay that way till Indians succeed in developing cryogenic rocket engine technology themselves as no one will help you or let you buy them for use in ballistic nuclear missiles.