Digital BW, The Print

I am about to buy a 2400, but wonder if I should wait for the new
R1900.  Does anyone know if it will have the ABW capabilities of the
2400?  

On another subject, I notice a huge variance in the amount of ink left
in the carts (N7) when the Epson R800 monitor tells me they need
replacement.  The first cart I replaced last night had no more than
10% of the ink in it (via visual inspection).  The second, which I had
to replace to get a cleaning cycle to work, had at least 30-40% of the
ink remaining.  I tried reinserting the cart a number of time to no
avail. Would a chip resetter work?

Regards,

Steve