Do not buy hardware for this yet. The GPU lane algorithm is new, and new proof-of-work algorithms are precisely where things go wrong. It gets an adversarial bounty aimed at its memory-hardness assumptions and an independent cryptographic audit before mainnet. If you are planning purchases around it, wait for the audit result rather than the announcement, and if the audit forces a change to the algorithm then whatever you bought was bought against a spec that no longer exists.
A GPU lane can be beaten. It can only be made unattractive. Memory-hard is not a wall, it is a price. If ATON ever became valuable enough, somebody would build hardware for this lane too, and the honest claim is that the margin for doing so is thin rather than that it is impossible. Anybody promising permanent resistance is selling you something.
Nobody can tell you what it will pay, including us. Mining return depends on the token price, the total hashrate on your lane and your electricity cost, and we do not know any of the three. Anybody publishing a profitability calculator for a chain that has not launched is filling in numbers they invented.
Two jobs on one card means two ways to be disappointed. Compute jobs only exist if somebody is paying for inference, and at the start the main customer is our own trading engine. If demand for mesh work turns out to be thin, the second income is thin with it, and the card goes back to being an ordinary miner.