The Full Moon / Penumbral Lunar Eclipse at 14 degrees Scorpio the day before the coronation (May 5) in his 4th House (home and family) squares his natal 1st House Pluto in Leo. In astro-symbolism this is Charles taking the royal power (Leo) from his dead (Pluto) mother (4th House).
Transiting Venus is conjunct his natal Uranus in Gemini, and opposite his natal Jupiter in Sagittarius. Charles' relationship to the media (Gemini) has been both unique and erratic (Uranus), as the first-ever Royal to be born & raised on television, under the 24/7 scrutinizing eye of modern media. Transiting Venus gives an aura of "grace and favor" wherever she goes; in this case, Charles is betting on positive media coverage, "giganticized" (Jupiter) in the international press (Sagittarius).
The Sun and Uranus conjunct in Taurus in his 10th House. In a very public way, his originality and uniqueness is displayed within the confines of tradition.
Transiting Pluto at 0 Aquarius (Retrograde) is in a hard square to his 10th House natal Moon at 0 Taurus. VERY public (10th House) conflicts involving women with the potential to transform the monarchy into something it has resisted since the beginning. The divorced King making his long-time lover, a divorcee, his Queen, overturns over a thousand years of monarchical precedent.
Astrology says that William & Kate will likely be the last royals ("From William to William") but as the penultimate King of Great Britain, it's now Charles' turn to strut and fret his hour upon the stage.