One way in which an object is affected by temperature rise is that the wavelength of the radiation it emits is gets smaller and smaller. Another way of looking at it is that as an object gets hotter, the electrons of the atoms orbit faster and faster. It seems that the maximum temperature and object could have is when:

A) The wavelength of the radiation reaches Planck length. 

B) When the speed of the electrons nears the speed of light.

Do processes A and B occur at the same temperature? Is it possible to have a wavelength smaller than Planck length, but it would be immeasurable (Would that be in some sense "infinite" or "negative temperature")?

Please keep the answers in layman's terms.