2.0 quite possibly does work with Lion. Lion is not 'brand new' to the market. I think Itch is actually up to 2.0.1
From the Serato site:
Does ITCH support Mac OS X Lion?
ITCH 2.0 does support Mac OS X Lion (10.7.X). The following are minor known issues that some users may encounter:
ITCH hardware not recognised after computer goes to sleep.
Hang when unplugging ITCH hardware.
We are working on these issues and will release a fix in a future release of ITCH.
Also, Itch specs:
What are the minimum system requirements for ITCH for Numark NS7?
PLEASE NOTE: These are the minimum requirements to run ITCH with the Numark NS7. For best performance and for use in professional situations we recommend you use a higher spec computer.
Windows
• 32-bit
Windows 7 / Vista: Intel* processor, 1.8GHz Core 2 Duo; 2MB L2 cache; 2GB RAM
Windows XP: Intel* processor, 1.8GHz Core 2 Duo; 2MB L2 cache; 1GB RAM
• 64-bit
Windows Vista: Intel* processor, 2.2Ghz Core 2 Duo; 2MB L2 cache; 4GB RAM
Windows 7: Intel* processor, 2.4GHz Core 2 Duo; 3MB L2 cache; 4GB RAM
• 1024 x 768 screen resolution
• Available USB 2.0 port
• Available Hard disk space for music
Macintosh
• Mac OS X 10.6
32-bit: Intel processor, 1.8GHz Core Duo; 1GB RAM
64-bit: Intel processor, 2.4GHz Core Duo; 4GB RAM
• Mac OS X 10.5 / 10.4.11
Intel processor, 1.8GHz Core Duo; 1GB RAM
• 1024 x 768 screen resolution
• Available USB 2.0 port
• Available Hard disk space for music
Other help:
http://serato.com/help/itch/numark
http://serato.com/forum/area/23
This looks rather important:
http://serato.com/forum/discussion/328242