Technical questions about moving to Helix

I've been considering moving to Helix and have a few questions:

- I have Videotron phone service through my Arris TM822 Cable modem - does the Helix unit have a battery backup as well for phone service?

- I would like to put the Helix gateway in Bridge mode as I have a high end commercial grade router and wifi setup; does the Helix gateway provide a true public IP address in bridge mode or is giving out a private RFC1918 IP address?  I would like to avoid double NATting.

- In Bridge mode, is native IPv6 available?

- If the technician were to give me the equipment to install myself and replace my TM822, would they also provide the security socket removal tool to remove the security sleeve from the coax?

- Are the security sleeves still required with phone service?

- I currently have 60/10 with my TM822 modem; would it be possible to upgrade to the 100mb Helix plan with my current equipment?

- What is the current upload speed offered with the 100mb Helix plan?  It is not listed on the website!

Thanks!