Let's put all factoids in a row (for the ones not reading the science article. You know who you are!)
1) The things look like cells
2) The 'cells' seem to contain proteins
3) In medium the cells multiply, an optimum temperature has been found at 300 degree Celsius.
4) 300 degree Celsius is far higher than any lifeform has yet been found to grow at.
5) The estimated amount that supposedly dropped down is 5 ton
6) The cells don't seem to grow good in solutions of
kitchensalt (NaCl) so they can't come from our oceans
7) They can survive iodine without problem and even seem to use it as food. No known earth microorganism does that.
8) They even survived 380 degree Celsius. Water turns into supercritical vapor at that 250 degree Celsius which raises the pressure in the cooker to about 220 atmosphere.
9) Different cell-cycles where observed, none of them like earth microbes (that i know).
10) New cells are 'growing' inside 'mothercells'. Once reached a certain size they slip out through the membrane and grow further.
11) No DNA was found. Either our techniques fail due to this being such a strange life form, or it uses something other than DNA.
12) The 'cells' absorb UV extremely strong. This could give it a protection against UV since it could prevent the UV from passing the inside of the 'cell' when the outerlayer blocks it. Ofcourse space is loaded with UV.
13) The 'cells' can grow without ANY PHOSPHORUS PRESENT.
No life form on earth can survive without any phosporus.
It is, among else, necessary for instance in construction of new DNA.
Red blood cells also lack DNA. They seem to get by without it for a couple of months.