Looking for "New Earth" around Alpha Centauri

"New Earth" is just my favourite way of referring to a hypothetical
planet orbiting around either one of the two principal stars in the
Alpha Centauri system, within their respective *habitable* zones.
So... assuming such a planet does exist, I'd like to know if we could
hope to see it *directly* through a telescope using special techniques
like masking out the glare of the star itself.

Focusing on Alpha Centauri 'A', which is of spectral type G2V -
exactly like the Sun - and whose habitable zone is located at between
1.2 to 1.3 AUs out, is there a projected *magnitude* that an
Earth-sized planet is expected to have? If indeed it exists, at
maximum elongation from the star New Earth would wander a total of 2.7
arc-seconds out and be amply within astrometric resolution limits for
even amateur sized telescopes! Since *resolution* is not an issue and
*masking* out the star itself in a telescope is no problems, then
clearly how bright such a planet is the determining factor for its
detection. I know Hubble has detected objects down to as low as 30th
magnitude, so I'm wondering if New Earth is expected to be of a
magnitude figure brighter than 30th magnitude and if the Hubble was
able to mask out the brilliance of Alpha Centauri 'A', whether or not
theoretically, it would have been able to image the planet directly.

I am also wondering if there's any projections for the expected
magnitude of a Jupiter-sized planet orbiting within the habitable
zones around each star. Why bother with a gas giant orbiting within
the habitable zone? Because New Earth could be one of the *moons* of
such a giant planet!

Any thoughts on the expected magnitudes of such exo-planets, anyone?

Abdul Ahad